bisecting fixing commit since 87ef12027b9b1dd0e0b12cf311fbcb19f9d92539 building syzkaller on 3642839c105d2c84160c10866805f903a22fa343 testing commit 87ef12027b9b1dd0e0b12cf311fbcb19f9d92539 with gcc (GCC) 8.1.0 kernel signature: 6d59c850931cafd409850bdaf905554d1c63ee8079ed7a63e0d3aaf295b152a5 all runs: crashed: kernel BUG at fs/ntfs/aops.c:LINE! testing current HEAD b3a9e3b9622ae10064826dccb4f7a52bd88c7407 testing commit b3a9e3b9622ae10064826dccb4f7a52bd88c7407 with gcc (GCC) 8.1.0 kernel signature: 25b206b5ff6703bebaffe7ccc6a55c364ec1165f0b370c2e0aefd60ad32fc909 all runs: crashed: kernel BUG at fs/ntfs/aops.c:LINE! revisions tested: 2, total time: 18m20.867381346s (build: 10m46.609331416s, test: 6m41.458610568s) the crash still happens on HEAD commit msg: Linux 5.8-rc1 crash: kernel BUG at fs/ntfs/aops.c:LINE! IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 ntfs: (device loop3): is_boot_sector_ntfs(): Invalid end of sector marker. ------------[ cut here ]------------ kernel BUG at fs/ntfs/aops.c:186! invalid opcode: 0000 [#1] SMP KASAN ntfs: (device loop4): is_boot_sector_ntfs(): Invalid end of sector marker. CPU: 1 PID: 3896 Comm: syz-executor3 Not tainted 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ntfs_read_block fs/ntfs/aops.c:186 [inline] RIP: 0010:ntfs_readpage+0x1793/0x1d60 fs/ntfs/aops.c:435 Code: 89 fa 48 c1 e0 2a 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 8b 85 18 ff ff ff 48 8b 80 30 fd ff ff a8 08 0f 85 1d f3 ff ff <0f> 0b 0f 0b 0f 0b be 01 00 00 00 48 89 df e8 1a de ff ff e9 4a ff RSP: 0018:ffff8881c76df6f0 EFLAGS: 00010246 RAX: 0000000000000230 RBX: ffff8881b5cbad08 RCX: ffffffff822bd405 RDX: 1ffff11036b97502 RSI: 0000000000000008 RDI: ffff8881b5cba810 RBP: ffff8881c76df870 R08: ffffed1036b97503 R09: ffffed1036b97503 R10: ffff8881b5cba817 R11: ffffed1036b97502 R12: ffffea0006d965e0 R13: ffff8881b5cba810 R14: ffffea0006d965c0 R15: dffffc0000000000 FS: 00007fae47855700(0000) GS:ffff8881db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000930008 CR3: 00000001c965e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_read_cache_page+0x65c/0x1370 mm/filemap.c:2765 read_cache_page+0x45/0x70 mm/filemap.c:2864 read_mapping_page include/linux/pagemap.h:437 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] map_mft_record_page fs/ntfs/mft.c:73 [inline] map_mft_record+0x182/0x990 fs/ntfs/mft.c:156 ntfs_read_locked_inode+0x18e/0x5250 fs/ntfs/inode.c:549 ntfs_read_inode_mount+0xa42/0x2140 fs/ntfs/inode.c:2074 ntfs_fill_super+0x1296/0x2e60 fs/ntfs/super.c:2857 mount_bdev+0x27b/0x340 fs/super.c:1417 ntfs_mount+0x10/0x20 fs/ntfs/super.c:3051 legacy_get_tree+0x103/0x1f0 fs/fs_context.c:592 vfs_get_tree+0x8b/0x2d0 fs/super.c:1547 do_new_mount fs/namespace.c:2874 [inline] do_mount+0x1293/0x1c40 fs/namespace.c:3199 __do_sys_mount fs/namespace.c:3409 [inline] __se_sys_mount fs/namespace.c:3386 [inline] __x64_sys_mount+0x169/0x1c0 fs/namespace.c:3386 do_syscall_64+0x6e/0xf0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x457eaa Code: Bad RIP value. RSP: 002b:00007fae47854bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000457eaa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fae47854c00 RBP: 00000000000000b2 R08: 000000002007e200 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 000000000000067c R14: 00000000006fcc40 R15: 0000000000000000 Modules linked in: ---[ end trace c658af7d989bb9ac ]--- ------------[ cut here ]------------ kernel BUG at fs/ntfs/aops.c:186! invalid opcode: 0000 [#2] SMP KASAN RIP: 0010:ntfs_read_block fs/ntfs/aops.c:186 [inline] RIP: 0010:ntfs_readpage+0x1793/0x1d60 fs/ntfs/aops.c:435 CPU: 0 PID: 3903 Comm: syz-executor4 Tainted: G D 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ntfs_read_block fs/ntfs/aops.c:186 [inline] RIP: 0010:ntfs_readpage+0x1793/0x1d60 fs/ntfs/aops.c:435 Code: 89 fa 48 c1 e0 2a 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 8b 85 18 ff ff ff 48 8b 80 30 fd ff ff a8 08 0f 85 1d f3 ff ff <0f> 0b 0f 0b 0f 0b be 01 00 00 00 48 89 df e8 1a de ff ff e9 4a ff RSP: 0018:ffff8881c6d176f0 EFLAGS: 00010246 Code: 89 fa 48 c1 e0 2a 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 8b 85 18 ff ff ff 48 8b 80 30 fd ff ff a8 08 0f 85 1d f3 ff ff <0f> 0b 0f 0b 0f 0b be 01 00 00 00 48 89 df e8 1a de ff ff e9 4a ff RAX: 0000000000000230 RBX: ffff8881b5c8fd08 RCX: ffffffff822bd405 RDX: 1ffff11036b91f02 RSI: 0000000000000008 RDI: ffff8881b5c8f810 RBP: ffff8881c6d17870 R08: ffffed1036b91f03 R09: ffffed1036b91f03 R10: ffff8881b5c8f817 R11: ffffed1036b91f02 R12: ffffea0006db89e0 R13: ffff8881b5c8f810 R14: ffffea0006db89c0 R15: dffffc0000000000 FS: 00007fcf41ca9700(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 RSP: 0018:ffff8881c76df6f0 EFLAGS: 00010246 CR2: 00007fc46b7619a9 CR3: 00000001c91c8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: RAX: 0000000000000230 RBX: ffff8881b5cbad08 RCX: ffffffff822bd405 RDX: 1ffff11036b97502 RSI: 0000000000000008 RDI: ffff8881b5cba810 do_read_cache_page+0x65c/0x1370 mm/filemap.c:2765 RBP: ffff8881c76df870 R08: ffffed1036b97503 R09: ffffed1036b97503 R10: ffff8881b5cba817 R11: ffffed1036b97502 R12: ffffea0006d965e0 read_cache_page+0x45/0x70 mm/filemap.c:2864 read_mapping_page include/linux/pagemap.h:437 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] map_mft_record_page fs/ntfs/mft.c:73 [inline] map_mft_record+0x182/0x990 fs/ntfs/mft.c:156 ntfs_read_locked_inode+0x18e/0x5250 fs/ntfs/inode.c:549 ntfs_read_inode_mount+0xa42/0x2140 fs/ntfs/inode.c:2074 ntfs_fill_super+0x1296/0x2e60 fs/ntfs/super.c:2857 R13: ffff8881b5cba810 R14: ffffea0006d965c0 R15: dffffc0000000000 mount_bdev+0x27b/0x340 fs/super.c:1417 ntfs_mount+0x10/0x20 fs/ntfs/super.c:3051 legacy_get_tree+0x103/0x1f0 fs/fs_context.c:592 vfs_get_tree+0x8b/0x2d0 fs/super.c:1547 FS: 00007fae47855700(0000) GS:ffff8881db100000(0000) knlGS:0000000000000000 do_new_mount fs/namespace.c:2874 [inline] do_mount+0x1293/0x1c40 fs/namespace.c:3199 __do_sys_mount fs/namespace.c:3409 [inline] __se_sys_mount fs/namespace.c:3386 [inline] __x64_sys_mount+0x169/0x1c0 fs/namespace.c:3386 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 do_syscall_64+0x6e/0xf0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x457eaa Code: Bad RIP value. RSP: 002b:00007fcf41ca8bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000457eaa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fcf41ca8c00 RBP: 00000000000000b2 R08: 000000002007e200 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 000000000000067c R14: 00000000006fcc40 R15: 0000000000000000 CR2: 0000000000930008 CR3: 00000001c965e000 CR4: 00000000001406e0 Modules linked in: ---[ end trace c658af7d989bb9ad ]--- DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 RIP: 0010:ntfs_read_block fs/ntfs/aops.c:186 [inline] RIP: 0010:ntfs_readpage+0x1793/0x1d60 fs/ntfs/aops.c:435 Code: 89 fa 48 c1 e0 2a 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 8b 85 18 ff ff ff 48 8b 80 30 fd ff ff a8 08 0f 85 1d f3 ff ff <0f> 0b 0f 0b 0f 0b be 01 00 00 00 48 89 df e8 1a de ff ff e9 4a ff DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 RSP: 0018:ffff8881c76df6f0 EFLAGS: 00010246